Trying to run conjure-up with the "OpenStack with NovaLXD" spell.
As soon as I make that choice, the .cache/conjure-up/conjure-up.log shows a lot of entries like this (specifically, the "permission denied" line) :

Got around this issue by 1) Getting new RAM 2) Getting new SSD 3) installing Ubuntu 16.04 instead of 18. 4) doing the snap install of lxd and then doing the migrate. Hopefully these datapoints can help someone out.
– ScottOct 25 at 18:35